NURS 5663 ADVANCED
PHARMACOLOGY WEEKLY QUIZZES
(WEEKS 1-6) QUESTIONS AND
ANSWERS
1. A patient with chronic renal failure is prescribed a drug that is primarily eliminated by the
kidneys. Which pharmacokinetic change should the nurse expect?
A. Increased volume of distribution
B. Reduced drug half-life
C. Increased risk of drug toxicity
D. Decreased bioavailability
Answer: C
Conceptual Explanation: Reduced renal clearance leads to drug accumulation and an
increased risk of toxicity because the kidneys cannot effectively filter the drug from the
bloodstream.
2. Which of the following describes the ‘first-pass effect’?
A. The rapid excretion of a drug by the kidneys after one pass.
,B. The binding of a drug to plasma proteins during initial absorption.
C. The distribution of a drug to the brain via the blood-brain barrier.
D. The metabolism of an oral drug by the liver before it reaches systemic circulation.
Answer: D
Conceptual Explanation: The first-pass effect refers to the metabolism of a drug in the
liver or intestines after oral administration but before it enters the systemic circulation,
often significantly reducing the active drug concentration.
3. An agonist drug is best defined as one that:
A. Binds to a receptor and prevents its activation.
B. Irreversibly inhibits enzyme activity.
C. Binds to a receptor and mimics the endogenous ligand.
D. Decreases the affinity of other drugs for the receptor.
Answer: C
Conceptual Explanation: Agonists bind to receptors and activate them, producing a
biological response similar to the body’s natural signaling molecules.
4. A drug has a half-life of 4 hours. If 100 mg is administered, how much remains after 12
hours?
A. 50 mg
B. 25 mg
, C. 12.5 mg
D. 6.25 mg
Answer: C
Conceptual Explanation: After 4 hours (1 half-life), 50 mg remains. After 8 hours (2 half-
lives), 25 mg remains. After 12 hours (3 half-lives), 12.5 mg remains.
5. Which statement regarding the Cytochrome P450 (CYP450) enzyme system is correct?
A. Inducers always increase the therapeutic effect of all drugs.
B. CYP450 inhibitors decrease the risk of drug toxicity.
C. CYP450 inducers speed up drug metabolism, potentially lowering drug levels.
D. Inhibitors lead to faster elimination of prodrugs.
Answer: C
Conceptual Explanation: Inducers increase the activity of enzymes, leading to faster
metabolism of substrate drugs, which often results in sub-therapeutic blood levels.
6. What is the primary rationale for monitoring ‘trough’ levels of Vancomycin?
A. To minimize the risk of nephrotoxicity and ototoxicity.
B. To confirm the drug has reached its peak concentration.
C. To ensure the dose is high enough to avoid resistance.
D. To evaluate the rate of hepatic metabolism.
PHARMACOLOGY WEEKLY QUIZZES
(WEEKS 1-6) QUESTIONS AND
ANSWERS
1. A patient with chronic renal failure is prescribed a drug that is primarily eliminated by the
kidneys. Which pharmacokinetic change should the nurse expect?
A. Increased volume of distribution
B. Reduced drug half-life
C. Increased risk of drug toxicity
D. Decreased bioavailability
Answer: C
Conceptual Explanation: Reduced renal clearance leads to drug accumulation and an
increased risk of toxicity because the kidneys cannot effectively filter the drug from the
bloodstream.
2. Which of the following describes the ‘first-pass effect’?
A. The rapid excretion of a drug by the kidneys after one pass.
,B. The binding of a drug to plasma proteins during initial absorption.
C. The distribution of a drug to the brain via the blood-brain barrier.
D. The metabolism of an oral drug by the liver before it reaches systemic circulation.
Answer: D
Conceptual Explanation: The first-pass effect refers to the metabolism of a drug in the
liver or intestines after oral administration but before it enters the systemic circulation,
often significantly reducing the active drug concentration.
3. An agonist drug is best defined as one that:
A. Binds to a receptor and prevents its activation.
B. Irreversibly inhibits enzyme activity.
C. Binds to a receptor and mimics the endogenous ligand.
D. Decreases the affinity of other drugs for the receptor.
Answer: C
Conceptual Explanation: Agonists bind to receptors and activate them, producing a
biological response similar to the body’s natural signaling molecules.
4. A drug has a half-life of 4 hours. If 100 mg is administered, how much remains after 12
hours?
A. 50 mg
B. 25 mg
, C. 12.5 mg
D. 6.25 mg
Answer: C
Conceptual Explanation: After 4 hours (1 half-life), 50 mg remains. After 8 hours (2 half-
lives), 25 mg remains. After 12 hours (3 half-lives), 12.5 mg remains.
5. Which statement regarding the Cytochrome P450 (CYP450) enzyme system is correct?
A. Inducers always increase the therapeutic effect of all drugs.
B. CYP450 inhibitors decrease the risk of drug toxicity.
C. CYP450 inducers speed up drug metabolism, potentially lowering drug levels.
D. Inhibitors lead to faster elimination of prodrugs.
Answer: C
Conceptual Explanation: Inducers increase the activity of enzymes, leading to faster
metabolism of substrate drugs, which often results in sub-therapeutic blood levels.
6. What is the primary rationale for monitoring ‘trough’ levels of Vancomycin?
A. To minimize the risk of nephrotoxicity and ototoxicity.
B. To confirm the drug has reached its peak concentration.
C. To ensure the dose is high enough to avoid resistance.
D. To evaluate the rate of hepatic metabolism.
